Impact wrench



FIG. 1 is a left side view of an impact wrench showing my design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for an impact wrench, as shown and described. 